A UV curable complex system with vinyl resin and polyurethane acrylate photo-polymerization was investigated. The UV curing process of complex system was traced by IR. Thermal decomposition temperature of UV cured film for various system were determined by thermogravimetric analysis(TGA). And physical properties of those curing films were analyzed and compared. The results show The results show the thermal decomposition temperature, and alkali resistance and hardness of the product gradually decreased with the increase in the proportion of polyurethane acrylic prepolymer.The vinyl resin pre polymer were synthesized by epoxy resin E-51 and acrylic acid.The polyurethane pre polymer was prepared by the reaction of polyether -1000 and TDI-80 with hydroxyethyl ester as the end capping agent. The two kinds of products were mixed in different proportions, and the vinyl resin was modified by polyurethane. Finally, diluent and photo initiator were added to the UV curing of products. The results showed that the vinyl resin and polyurethane prepolymer were successfully prepared. The properties of the products were evaluated by IR, TGA and other methods. The alkali resistance and hardness of curing films have been tested.

Abstract.A series of waterborne polyurethanes (WPUs) were synthesized by a pre-polymer process from isophorone diisocyanate and polycarbonatediol (PCDL), polycaprolactone (PCL). Fourier transform infrared spectroscopy, thermal gravimetric analysis, dynamic thermomechanical analysis and mechanical measurements were employed to characterize the thermal stability, physical and mechanical properties of the films derived from the emulsions. The results show that there is better mechanical properties of and thermal stability for PCL-based WPU. The thermal stability of PCDL-PCL based WPU, whichin the mass ratio of PCDL to PCL is 1 to 1 is the best. The PCDL-based WPU has the highest glass transition temperature.